update processing,customer and staff

lib/pages/profile/profile_page.dart

@@ -21,6 +21,7 @@ import 'package:provider/provider.dart';
 import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 
 import '../../helpers/theme.dart';
+import 'package:collection/collection.dart';
 
 typedef void ProfileCallback();
 
@@ -202,9 +203,11 @@ class _ProfileState extends State<Profile> {
         Provider.of<StaffModel>(context, listen: false).privileges;
 
     if (user == null || user.isCustomer()) return Container();
+
     List<Privilege> privileges = [];
     user.privileges.forEach((e) {
-      var p = _privileges.firstWhere((p) => p.id == e);
+      Privilege? p = _privileges.firstWhereOrNull((p) => p.id == e);
+
       if (p != null) {
         privileges.add(p);
       }